12in x 18in Aqua self-healing professional quality rotary cutter mat specially designed for use with OLFA rotary cutters is a convenient size for taking along. Rotary mats protect your work area and greatly extend the life of your rotary blades. 1.5mm thick. Double-sided mat is solid Aqua on one side for general crafting and has yellow grid lines on the other side for detailed cutting. Self-healing finish reseals surface cuts, providing a continually smooth surface for all cutting projects. For use only with rotary cutters and blades; fixed-blade knives may damage the mat. Store flat and out of direct sunlight.